JP4047924B2 - Step structure of motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a step guard structure suitable for a step structure of a motorcycle, particularly a pillion step for passengers.
[0002]
[Prior art]
2. Description of the Related Art A motorcycle in which an exhaust pipe and a muffler are disposed inside a rear cowl and a pillion step is disposed in the vicinity of the exhaust pipe and the muffler is known (see, for example, Japanese Patent No. 2771211).
[0003]
Also, as in Japanese Utility Model Publication No. 4-42227, a pillion step is arranged outside the muffler without a rear cowl, and a step guard made of a wire rod is provided on the surface of the muffler.
[0004]
[Problems to be solved by the invention]
In the type in which an exhaust system component such as an exhaust pipe is built in the rear cowl, the rear cowl itself functions as a step guard that separates the exhaust system component that is a heat source from the pillion step, and thus it is not necessary to provide a special step guard.
[0005]
On the other hand, when the pillion step is arranged in the vicinity of the exhaust system parts without the rear cowl, it is preferable to provide a step guard. However, in this case, if the step guard is multi-functional and has a guard function that prevents the pillion step in the housed state from being inadvertently raised, it is preferable for the pillion step that can be raised and lowered. Therefore, the present invention aims to realize such a demand.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a motorcycle step structure according to the present invention is arranged in the vicinity of an exhaust system component and includes a step that can be raised and lowered between a use state and a storage state.
A step guard that covers the entire length of the step in the stowed state from the inside of the vehicle body is provided, and the upper part of the step guard is bent outwardly to protrude outward to partially cover the step in the stowed state. Protruding portions are provided. Here, the exhaust system parts are parts provided along the exhaust path of the engine, and include at least one of a muffler, a muffler cover, and an exhaust pipe.
[0007]
At this time, the rear side of the step guard may be an inward directing portion that bends inward of the vehicle body, and the rear end portion of the inward directing portion may overlap the exhaust system component in plan view. Also, the step guard can be formed by forming a wire rod in a loop shape.
Furthermore, the step guard can be floated and supported on the step support member via the dynamic damper.
[0008]
【The invention's effect】
Since the step guard is placed inside the step body and an outward projection is provided on the top, the outward projection covers the entire length of the step so that it does not inadvertently occur I can guard. Further, when in use, the outward projecting portion can be positioned so that the position of the occupant's foot on the step is more outward.
[0009]
In addition, since the inward directing portion is provided at the rear portion of the step guard so as to enter and overlap the lower part of the exhaust system part in plan view, an unnecessary protruding end portion can be prevented from being provided even if the step guard is provided. Further, if the step guard is formed by making the linear member into a loop shape, the step guard can be easily formed, the degree of freedom of the shape is increased, and the weight can be reduced.
[0010]
Also, if floatingly supported the step guard through the dynamic damper to the step support member, together with the vibration damping effect of the step support member by the dynamic damper can be obtained, that the step guard in a part of the U Eight of the dynamic damper it can. In addition, since the step guard is floatingly supported, the vibration isolation effect of the step guard itself can be increased, vibration transmitted from the step guard to the step guard can be reduced, and vibration transmission from the step guard to the occupant can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment will be described below with reference to the drawings. FIG. 1 is a left side view of a motorcycle to which this embodiment is applied, and FIG. 2 is a plan view thereof. In these figures, a double seat 3 is disposed between a front wheel 1 and a rear wheel 2, a fuel tank 5 is provided in front of the driver's seat 4, and a rear cowl 7 is provided from the left and right sides of the passenger seat 6 to the rear. The rear cowl 5 and the rear cowl 7 are arranged on the front and rear sides of the driver's seat 4, and overhanging portions 8 and 9 are formed on both the left and right sides.
[0012]
As shown in FIG. 2, the shape of the fuel tank 5 in a plan view is such that the front half portion has a substantially rhombus shape, and the ridge line 8 a that outlines the overhanging portion 8 gradually extends sideward from the front end side to the maximum projecting portion 8 b. A widening curve is formed, and the rear part from the maximum projecting part 8b is changed to gradually converge toward the center of the vehicle body. The projecting part 8 projects to the side larger than the general side face 8c of the fuel tank 5 as the base part. Further, the protruding portion 9 of the rear cowl 7 also has a ridgeline 9a that forms a contour line that gradually spreads from the front to the rear up to the maximum protruding portion 9b, and the rearward from the maximum protruding portion 9b conversely converges toward the vehicle body center side. .
[0013]
A four-cycle water-cooled in-line four-cylinder engine 10 is disposed below the fuel tank 5, and is sucked through an air cleaner 11 and a fuel injection device 12. Exhaust gas is exhausted through an exhaust pipe 13 and a muffler 14. . The exhaust pipe 13 passes under the engine 10 and then rises upward at the rear of the pivot plate 17. After crossing the rear fork 18 in a side view, the exhaust pipe 13 branches into a pair of mufflers disposed on the left and right sides of the vehicle body below the rear cowl 7. Connecting. Each of the left and right mufflers is covered with a muffler cover 14 on the side where the surface is to be seen.
[0014]
A part of the fuel injection device 12 is covered with an injection device cover 15 disposed close to and below the bottom rear portion of the fuel tank, and covered with a rear side surface cover 16 of the air cleaner 11. The side cover 16 extends below the driver's seat 4 and is in contact with the bottom thereof.
[0015]
A pivot plate 17 is disposed below the side cover 16 and behind the engine 10 so as to extend in the vertical direction. A pivot shaft 17 a supports the front end of the rear fork 18 so as to be swingable. Buffered.
[0016]
A front end portion of a step holder 20 having a substantially Y shape in side view is attached to the rear portion of the pivot plate 17, and the rear side overlaps with the rear wheel 2 in the side view and extends backward to a position below the passenger seat 6. The pillion step 21 for passengers is attached so as to be foldable.
[0017]
In the figure, reference numeral 22 is a front fork, 23 is a head pipe, 24 is a headlight, 25 is a meter, 26 is a handle, 27 is a body frame, 28 is a rider step for riders, 29 is a movable rear fender, and 30 is a chain. A case, 31 is a grip bar, 32 is a tail lamp, 33 is a rear winker, 34 is a license plate, 35 is a rider, and 36 is its knee.
[0018]
3 is a plan view of the pillion step in the stowed state where the pillion step portion on the right side of the vehicle body is shown from above the vehicle body, FIG. 4 is a side view of the step holder in which the pillion step is in use, and FIG. FIG. 6 is a cross-sectional view showing the attachment state of the step guard via the dynamic damper.
[0019]
3 and 4, a substantially U-shaped stay 40 is integrally provided at the rear portion of the step holder 20 made of a light alloy casting or the like, and the end of the pillion step 21 is freely rotatable by a shaft 41. Mounted on. The pillion step 21 can be raised and lowered between the storage state shown in FIG. 3 and the use state shown in FIG.
[0020]
The rear end portion of the step holder 20 constitutes a step protector 42 extending further rearward from the stay 40, and the pillion step 21 in the housed state overlaps the outside. The rear end portion of the step protector 42 is close to the muffler cover 14 that is an exhaust system component.
[0021]
A step guard 43 is attached to the inside of the step protector 42 via a dynamic damper 47. The step guard 43 is formed in a loop shape using an appropriate wire material such as a wire, and both ends 44 and 45 are welded to the vehicle body inner surface of the weight 48 in the dynamic damper 47.
[0022]
The main body portion of the step guard 43 forms an outward projecting portion that protrudes by bending the upper portion of the step protector 42 outward from the vehicle body. As shown in FIG. It covers only part of the top surface. Further, the rear portion of the step guard 43 forms an inward directing portion 46 bent inward of the vehicle body, and the rear end portion of the inward directing portion 46 enters under the muffler 14 in a plan view of FIG.
[0023]
As shown in FIG. 5, the passenger 37 straddles the overhanging portion 9 of the rear cowl 7, and lowers the leg 38 sufficiently away from the outside of the muffler 14 and the muffler 49 located inside thereof, so that the front end is longer than the overhanging portion 9. The foot 39 can be put on the pillion step 21 in a use state in which protrudes outward. At this time, the upper portion of the step guard 43 forms an outward projecting portion, whereby the foot 39 can be positioned further outward.
[0024]
As is apparent from FIG. 6, which shows the structure of the dynamic damper in a schematic cross section, the dynamic damper 47 is composed of a weight 48 and an elastic body 50 made of an appropriate elastic material such as rubber, and passes through a through hole 51 provided in the step protector 42. Inserted, the plate 52 is overlapped on the end from the outside of the vehicle body, and is combined and integrated with the weight 48 by the bolt 53. At this time, the step guard 43 is also welded to the weight 48 to form a part of the weight of the dynamic damper 47.
[0025]
Next, the operation of this embodiment will be described. Since the step guard 43 is disposed inside the car body of the pillion step 21 and the outward projecting portion is provided on the upper portion thereof, when the pillion step 21 is in the retracted state, the outer projecting portion covers the entire length, and the pillion is inadvertently covered. Guarding to prevent step 21 from occurring. Further, when in use, the outward protrusion can be positioned so that the position of the occupant's foot 39 on the pillion step 21 is more outward.
[0026]
In addition, an inward directing portion 46 is provided at the rear portion of the step guard 43 so as to enter and overlap below the muffler cover 14 that is an exhaust system component in a plan view. Can be avoided. Furthermore, since the step guard 43 is formed by making the linear member into a loop shape, the step guard 43 can be easily formed, the degree of freedom of the shape is increased, and the weight can be reduced.
[0027]
Further, since the step guard 43 is floated and supported to the side of the step holder 20 as the step support member via the dynamic damper 47, the dynamic damper 47 reduces vibration of the step holder 20 with respect to the step holder 20 and transmits vibration to the foot 39. The step guard 43 further reduces vibration transmission from the pillion step 21 side, and can reduce vibration transmission to the foot 39.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle to which an embodiment is applied. FIG. 2 is a plan view of the same. FIG. 3 is a plan view of a pillion step. FIG. 4 is a side view of a step holder. Fig. 6 is a sectional view showing the structure of the dynamic damper.
3: double seat, 4: driver seat, 6: passenger seat, 7: rear cowl, 14: muffler, 20: step holder, 21: pillion step, 43: step guard, 47: dynamic damper

Claims (7)

In a motorcycle with a step that is arranged in the vicinity of an exhaust system part and can be raised and lowered between a use state and a storage state,
A step guard that covers the entire length of the step in the stowed state from the inside of the vehicle body is provided, and the upper part of the step guard is bent outwardly to protrude outward to partially cover the step in the stowed state. A step structure for a motorcycle, characterized in that a protrusion is provided. The rear portion of the step guard is an inwardly directed portion that bends inwardly of the vehicle body, and the rear end portion of the inwardly directed portion is overlapped under an exhaust system component in plan view. The motorcycle step structure. The step structure of a motorcycle according to claim 1 or 2, wherein the step guard is formed by looping a wire.   The step structure of the motorcycle according to any one of claims 1 to 3, wherein the step guard is floated and supported by a step support member via a dynamic damper. The step structure of a motorcycle according to claim 1, wherein the step is a pillion step attached to a step support member provided in the vehicle body frame. The step structure of a motorcycle according to claim 5, wherein a step protector is provided on the step support member so that a pillion step in a stored state overlaps the outside. The motorcycle step structure according to claim 4, wherein the weight of the dynamic damper is attached to an elastic body provided on the step support member from the inside of the vehicle body.

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